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Help needed in changing contents of portion of the file

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Top Forums Shell Programming and Scripting Help needed in changing contents of portion of the file
# 1  
Old 07-08-2008
Help needed in changing contents of portion of the file
Hi all,

I need help on this.

I have a file with 4500 bytes. I want to modify the contents of line from 1357 through 3208.

1. Starting 1357, there is 35 occurence of 40 bytes data making it to 2757.

2. The remaining 451 filler with spaces taking it to 3208.

Now, the 40 byte data is changing to 43 bytes. Hence the filler reduces to 347.

I want to add 3 spaces on the 5th position of that 40 byte data (in all 35 occurences). So my contents will start from 1357 and end in 2862 and then append 347 spaces till 3208

I have attached a sample record in tmp.txt to avoid confusion.

Any help is highly appreciated
JAK
tmp.txt (4.4 KB) 
# 2  
Old 07-08-2008
Clarification -- files with multiple records and each record size is 4500 bytes.

Thanks!
# 3  
Old 07-09-2008
Solved it .. thx !
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